JPS62266318A - Burner - Google Patents

Abstract

PURPOSE:To burn a fuel with flame at a proper air-fuel ratio by controlling the quantity of combustion air to be supplied by a blower in accordance with the opening degree of a proportional control valve controlling in accordance with the setting of heat generating quantity setting means and the output of a combustion sensor. CONSTITUTION:When a temperature knob 54 is manipulated, a reference voltage outputted rapidly varies with respect to the output of a water temperature sensor 53, the quantity of power supplied from a proportional valve control circuit 61 to a proportional control valve 45 varies immediately to vary the opening degree of a proportional control valve 45. In accordance with the quantity of power supplied to the proportional control valve 45, blower control circuit 62 varies the quantity of power supplied to a blower 33. Hence, the opening degree of the proportional control valve 45 varies and at the same time, the blower 33 supplies combustion air in accordance with the opening degree. Accordingly, the fuel burns with flame constantly at a proper air-fuel ratio. Further, in a case where, by the change in the composition of the gas supplied, flame does not burn at the proper air-fuel ratio, the blower control circuit 62 controls the quantity of power supplied to the blower 33 to compensate for the quantity of combustion air supplied. Therefore, the fuel constantly burns with flame at a proper air-fuel ratio.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a combustion device equipped with a proportional control valve that supplies fuel to a burner and a blower that supplies air for combustion to the burner.

[Prior art 1] Combustion type water heaters, combustion type heating systems, etc. that supply fuel such as gas or oil to burners according to the ratio of a proportional control valve, and also supply air for combustion to the burners using a blower. combustion equipment is used.

Conventionally, this type of device has a ratio of 1 to 1 depending on the calorific value setting means (for example, temperature 1 setting means) set by the user.
No. 21 No. 1 valve trace is set and 1. ,! i
At the same time that i':l is supplied, air is supplied to the burner by the blower, and the burner burns the fuel. At this time, the amount of combustion air supplied by the feeder is controlled according to the output of a combustion sensor (for example, a thermocouple) that detects the state of the burner flame.

[Problems to be Solved by the Invention] However, in conventional combustion devices, as described above, the circuit that controls the proportional control valve and the circuit that controls the blower are separate and separate circuits. For example, when the heat generation δ setting means is changed, the opening degree of the proportional control valve changes quickly in response to the change in the heat generation m setting means.
The amount of combustion air supplied by HI is determined by a heating value setting means, in which a combustion sensor first detects a change in the flame due to a change in the opening degree of the proportional control valve, and the amount of air blown by the blower is changed based on the change in the output of the combustion sensor. The problem was that the blower had very poor responsiveness to changes in air.

Immediately after changing the heating value setting means using this desk,
Since combustion air corresponding to the fuel supplied to the burner is not supplied to the burner, proper combustion is not performed, and there is a possibility that toxic exhaust gas such as CO is generated.

The present invention has been made in view of the above circumstances, and its object is to quickly change the opening degree of the proportional control valve and the supply of combustion air by one stroke of the feed by applying changes in the calorific value setting means. The objective is to provide a combustion device that can be adapted to the above.

[Means for Solving the Problems 1] In order to achieve the above object, the present invention includes a burner, a proportional control valve for supplying fuel to the burner, and a proportional control valve for supplying combustion air to the burner. a combustion sensor that detects the combustion state of the burner, a heat generation m setting means, a ratio valve control circuit that controls the opening degree of the proportional control valve according to the setting of the heat generation amount setting means; A technical means includes a blower control circuit that controls the supply of combustion air according to the blowing amount according to the opening degree of the proportional control valve and the output of the combustion sensor.

[Operation and Effects of the Invention 1] The present invention, which consists of the above configuration, controls the proportional valve control circuit in accordance with the output of the heat generation m setting means, so that when the heat generation amount setting means is changed, the proportional control valve is quickly activated. The opening degree changes according to the change in the calorific value setting means.On the other hand, by controlling the air flow rate of the combustion blower Jilti according to the opening degree of the proportional control valve, when the calorific value setting means is changed, the proportional υ
Since the opening degree of the control valve changes, the amount of combustion air supplied by the blower changes in accordance with the change in the heat generation ff1Eu determining means. As a result, the opening degree of the proportional control valve and the supply of combustion air by the blower are quickly changed to an appropriate value in response to changes in the constant heat generation means, and the flame is combusted at an appropriate air-fuel ratio.

In addition, by correcting and controlling the amount of combustion air supplied by the blower according to the combustion state of the burner detected by the combustion sensor, combustion air is supplied to the burner even if the signal related to brushing of the proportional control valve is incorrect. supply (B) is corrected to an appropriate value, and the flame is burned at an appropriate air-fuel ratio.

[Example 1 ★+l-''
An example of rP of ゝtake1 [amount 1 e) []A will be explained based on the drawings.

FIG. 2 shows a schematic diagram of a gas water heater.

This gas water heater 1 includes a combustion section 3 equipped with a heat exchange section 2,
Gas (composed of a supply path 4 and an electronic control circuit 5).

The combustion section 3 includes a combustion chamber 32 equipped with a surface-combustion type burner 31 having a ceramic shell, and a blower 3 installed at the bottom of the combustion chamber 32 to supply air for combustion to the burner 31.
A combustion air supply section 34 having a
It is provided with an air bleed port 35 for conducting air. The heat exchange section 2 includes fins 21 and water supply pipes 22 that increase heat exchange efficiency.
It is arranged between the burner 31 and the υF air port 35, and the water sent from the upstream of the water supply pipe 22 exchanges heat with the combustion gas in the combustion chamber 32 and flows out as hot water.

The gas supply path 4 is provided upstream of a gas jetting nozzle 41 that discharges gas upstream of the burner 31 and a gas supply distribution line 42 that supplies gas to the gas jetting nozzle 41, and is energized and J1 energized. There is an on-off valve 43 which opens and closes the valve, and a bub valve 44, which is provided downstream of the dish-closing valve 43 and adjusts the flow of gas, and a bub valve 44, which is provided downstream of the gab valve 44, and which adjusts the gas flow according to the electrical current. It consists of a proportional control valve 45 whose opening ratio is variable.

The electronic control circuit 5 includes a spark electrode 51 that makes sparks fly on the top surface of the burner 31 when ignited, a combustion sensor 52 that is a combustion sensor that detects the oxygen supply state of the flame at the null of the burner 31, and a water supply pipe 22 of the heat exchange section 2. A water humidity sensor 53 is attached to the outflow part of the heat exchanger 2 to detect the water temperature, and a temperature adjustment volume 5 is operated by the user and serves as a calorific value setting means to set the temperature of the water flowing out from the water supply pipe 22 of the heat exchanger 2.
4. Drives and controls the blowing gravel 33, on-off valve 43, proportional control valve 45, etc.

Next, control of the opening ratio of the proportional control valve 45 and control of the amount of combustion air supplied by the blower 33 will be explained based on the block diagram shown in FIG.

The output signal from the water temperature sensor 53 and the reference value obtained by the temperature control volume 54 are compared and amplified, and the output is used to control the current flow to the proportional control valve 45, thereby adjusting the frontage ratio of the proportional control valve 45. control gas water heater 1
A proportional valve control circuit (temperature adjustment circuit) 61 adjusts the temperature of the hot water obtained from the process, and detects the energization supplied from the proportional valve control circuit 61 to the proportional control valve 45, and connects the thermocouple 52 between the energization and the Send J! according to the output! The blower control circuit 62 controls the energization of the 1li33 and supplies combustion air according to the opening degree of the proportional control valve 45.

The gas water heater 1 of this embodiment is equipped with the electronic control device 5 as described above, so that the user can change the temperature of hot water supplied from the gas water heater 1 by operating the temperature control volume 54. When desired, the reference voltage output from the water temperature adjustment volume 54 changes quickly with respect to the output of the water temperature sensor 53 due to changes in the temperature adjustment polygon 1-54. The current supplied to the proportional control valve 45 changes instantaneously in accordance with the operation of the temperature regulating polymer 1-54, thereby changing the opening degree of the proportional control valve 45. When the amount of energization supplied to the proportional control valve 45 changes, the blower control circuit 62 changes the energization period to the blower 33 according to the change in the amount of energization. Therefore, almost at the same time as the opening degree of the proportional control valve 45 changes. The blower 33 supplies combustion air according to the opening degree of the proportional control valve 450. In other words, when the operator operates the temperature control volume 54, the opening degree of the proportional control valve 45 and the rotation speed of the blower 33 change instantly, and the
Water at the desired temperature is quickly supplied from the gas water heater 1. At this time, the opening degree of the proportional control valve 45 and the rotational speed of the blower 33 change almost simultaneously, so the proportional control valve The ratio between the amount of gas supplied by the blower 45 and the amount of combustion air supplied by the blower 33 is maintained at an appropriate value, and the flame is always combusted at an appropriate air-fuel ratio.

On the other hand, the water temperature sensor 53 constantly monitors the temperature of the intestine supplied from the gas water heater 1, and the temperature detected by the water temperature sensor 53 matches the 1'C temperature set by the temperature 1α adjustment polylm 54. By controlling the proportional valve control circuit 61 so that Supplementary low temperature is applied to the temperature set by the 1α adjustment volume 511.

Furthermore, the proportional control valve 4 If the combustion air set according to the opening degree of G is not supplied and the flame does not burn at the appropriate air-fuel ratio,
: In response to the output of the thermocouple 52, the I!
Since the liI + geometry control circuit 62 performs feedback control on the current supply to the blower 33 to correct the supply m of combustion air, the flame is always burned at an appropriate air-fuel ratio.

Note that the blower control circuit 62 is provided with, for example, one
This is provided to cancel the input from the thermocouple 52 for 0 seconds to prevent malfunction of the air-fuel ratio control by the thermocouple 52 at the time of ignition.

FIG. 3 shows another embodiment of the invention.

In the above-mentioned implementation (see 1), an example was shown in which when the temperature adjustment polymer j-me 54 was operated, the energization period to the proportional control valve 45 and the amount of energization to the blower 33 were changed almost simultaneously.
The response speed of the blower 33 changes more gently than the response speed of the proportional control valve 45, so if the amount of current to the proportional control valve 45 and the blower r:TvU 33 is changed almost simultaneously, immediately after the change, the blower J, ! There were cases where the rotational speed of the lit+ffi 33 could not follow the opening degree of the proportional control valve 45, and the air-fuel ratio changed significantly. Therefore, in this embodiment, a delay circuit 63 is provided on the input side of the proportional control valve 45 to delay the signal. As a result, the proportional a, 1110 valve 45 is
Since the opening degree of the temperature control volume 54 can be changed, the change in the air-fuel ratio immediately after the temperature control volume 54 is operated can be kept small compared to the above embodiment.

In addition, in the above embodiment, the opening degree of the proportional control valve was detected by the amount of current supplied to the proportional control valve from the proportional valve control circuit, but by detecting the displacement amount of the valve body of the proportional control valve, The opening degree of the proportional control valve may also be detected.

In the above embodiment, when the flame does not burn at an appropriate air-fuel ratio, the output of the combustion sensor is used to correct the amount of combustion air supplied by the blower. Feedback control of both pumps in the control circuit to control the opening of the proportional control valve and the supply of combustion air■
The air-fuel ratio of the flame may be controlled to an appropriate level by correcting both of the above.

Further, in the above embodiment, an example was shown in which the present invention was applied to a water heater, but the present invention may be applied to other combustion devices such as a heating device.

Further, in the above embodiment, an example is shown in which gas is used as the fuel 4, but the present invention may also be applied to a pond combustion device using kerosene or the like as fuel.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a control circuit according to the present invention, FIG. 2 is a schematic diagram of a gas water heater, and FIG. 3 is a block diagram of a control circuit according to another embodiment. In the diagram 1... Gas water heater 31... Burner 33.
...Reverse wind fan 42...Gas supply piping 45...Proportional control 9 valves 52...Thermocouple 53...Water temperature sensor 4)-54...Volume for temperature adjustment 61...
・Proportional valve control circuit 62...Blower control circuit

Claims (1)

[Scope of Claims] 1) A burner, a proportional control valve that supplies fuel to the burner, a blower that supplies combustion air to the burner, and a combustion sensor that detects the combustion state of the burner; calorific value setting means; a proportional valve control circuit that controls the opening degree of the proportional control valve according to the setting of the calorific value setting means; A combustion device including a blower control circuit that controls the amount of combustion air supplied by the blower. 2) The combustion device according to claim 1, wherein the combustion sensor is a thermocouple that detects the temperature of the flame and the state of air supply to the flame. 3) The combustion device according to claim 1 or 2, wherein the opening degree of the proportional control valve is detected from the output of the proportional valve control circuit that is supplied to the proportional control valve. .